Except it's not a standard. It's "everyone has a different API that is broken in another way". But you can threaten legal action if they don't fix it or help you, which gets stuff done.
I have genuinely no clue what that is. I don't think it's the same thing as Open Banking, though. The FCA did just fine NatWest a quarter of a billion for their blatant money laundering.
There already is a standard for open banking in the EU with PSD2.